Black Beans and White Beans

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PROFILE of Dr. George H. Gallup. Everybody is for Dr. Gallup's purposes, three thousand people. This is best explained in terms of black beans & white beans, as Dr. Gallup has done in a pamphlet called "The New Science of Public Opinion Measurement." Dr. G. reproduces a table compiled by Dr. Brown, of Harvard, showing "probable error due to size of sample." The reader who wishes to follow Brown's reasoning will provide himself with a barrel containing an equal amount of white & black beans. If he will then perform, 1000 times, the operation of scooping up 2500 beans, he will find that only three times out of 1000 have the percentages of black & white beans varied more than three per cent.